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Proceedings Paper

IMAKA: imaging from Mauna KeA with an atmosphere corrected 1 square degree optical imager
Author(s): Olivier Lai; Mark Chun; Jean Charles Cuillandre; Ray Carlberg; Harvey Richer; David Andersen; John Pazder; John Tonry; René Doyon; Simon Thibault; Jim Dunlop; Chris Pritchet; Jean Pierre Véran; Christ Ftaclas; Peter Onaka; Klaus W. Hodapp; Robert A. McLaren; Emmanuel Bertin; Yannick Mellier; Pierre Astier; Reynald Pain
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Paper Abstract

The goal of this project is to achieve exquisite image quality over the largest possible field of view, with a goal of a FWHM of not more than 0.3" over a square degree field in the optical domain. The narrow PSF will allow detection of fainter sources in reasonable exposure times. The characteristics of the turbulence of Mauna Kea, a very thin ground layer with excellent free seeing allows very wide fields to be corrected by GLAO and would make such an instrument unique. The Ground Layer AO module uses a deformable mirror conjugated to the telescope pupil. Coupled with a high order WFS, it corrects the turbulence common to the entire field. Over such large fields the probability of finding sufficiently numerous and bright natural guide sources is high, but a constellation of laser beacons could be considered to ensure homogeneous and uniform image quality. The free atmosphere seeing then limits the image quality (50% best conditions: 0.2" to 0.4"). This can be further improved by an OTCCD camera, which can correct local image motion on isokinetic scales from residual high altitude tip-tilt. The advantages of the OTCCD are not limited to improving the image quality: a Panstarrs1 clone covers one square degree with 0.1" sampling, in perfect accordance with the scientific requirements. The fast read time (6 seconds for 1.4 Gpixels) also leads to an improvement of the dynamic range of the images. Finally, the guiding capabilities of the OTCCD will provide the overall (local and global) tip-tilt signal.

Paper Details

Date Published: 14 July 2008
PDF: 12 pages
Proc. SPIE 7015, Adaptive Optics Systems, 70154H (14 July 2008); doi: 10.1117/12.790114
Show Author Affiliations
Olivier Lai, Canada-France-Hawaii Telescope (United States)
Mark Chun, Institute for Astronomy, Univ. of Hawaii at Hilo (United States)
Jean Charles Cuillandre, Canada-France-Hawaii Telescope (United States)
Ray Carlberg, Univ. of Toronto (Canada)
Harvey Richer, The Univ. of British Columbia (Canada)
David Andersen, Herzberg Institute for Astrophysics (Canada)
John Pazder, Herzberg Institute for Astrophysics (Canada)
John Tonry, Institute for Astronomy, Univ. of Hawaii at Manoa (United States)
René Doyon, Groupe d'Astrophysique, Univ. de Montréal (Canada)
Simon Thibault, Immervision (Canada)
Jim Dunlop, The Univ. of British Columbia (Canada)
Chris Pritchet, Univ. of Victoria (Canada)
Jean Pierre Véran, Herzberg Institute for Astrophysics (Canada)
Christ Ftaclas, Institute for Astronomy, Univ. of Hawaii at Hilo (United States)
Peter Onaka, Institute for Astronomy, Univ. of Hawaii at Manoa (United States)
Klaus W. Hodapp, Institute for Astronomy, Univ. of Hawaii at Hilo (United States)
Robert A. McLaren, Institute for Astronomy, Univ. of Hawaii at Manoa (United States)
Emmanuel Bertin, Institut d'Astrophysique de Paris (France)
Yannick Mellier, Institut d'Astrophysique de Paris (France)
Pierre Astier, IN2P3 (France)
Reynald Pain, IN2P3 (France)

Published in SPIE Proceedings Vol. 7015:
Adaptive Optics Systems
Norbert Hubin; Claire E. Max; Peter L. Wizinowich, Editor(s)

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